In essence, the planet runs on a cycle of water-splitting by photosynthesis to form oxygen and the production of water by respiration.
Paul G. Falkowski in Life's Engines: How Microbes Made Earth Habitable
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A commonplace book: an old-fashioned literary diary for recording interesting items from reading you've done. I use mine to record snippets from reading, conversation and life in general. (The early 2003 entries are from a period some years ago -- before the blog age -- when I tried an online commonplace book as a straight web page.)
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